/Engine/Source/Runtime/Core/Public/Serialization/Archive.h
Do not use SerializeCompressed in new code, prefer SerializeCompressedNew instead. SerializeCompressedNew can be dropped in to any existing use of SerializeCompressed.
void SerializeCompressed ( void * V, int64 Length, [FName](API\Runtime\Core\UObject\FName) CompressionFormatCannotChange, ECompressionFlags Flags, bool bTreatBufferAsFileReader )